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Answer:
(2x-5)+(x-10)=90
2x-5+x-10=90
2x+x-5-10=90
3x-15=90
3x=90+15
3x=105
x=105/3
x=35
angleAOC=2x-5
=2×35-5=65
angleBOC=x-10
=35-10=25
2)
angleAOB=2x
angleBOC=3X
AOB+BOC=AOC
2X+3X=75
5X=75
X=75/5
X=15
AOB=2×15=30
BOC=3×15=45
HENCE PROVED
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